Grease a 9x5 inch loaf pan and set aside. Preheat oven to 325 degrees F.
In the bowl of your stand mixer with the paddle attachment, combine pumpkin, sugar, vegetable oil, and eggs. Mix until smooth and combined. Scrape down the sides and bottom of your bowl.
In a separate bowl, whisk together flour, baking soda, baking powder, nutmeg, all spice, cinnamon, and salt.
With the mixer on low speed, slowly add the dry mixture into the wet. Mix until combined and no more. The batter will be thick, but take care to not over mix or your loaf will be dense.
Pour your batter into your prepared loaf pan.
Bake at 325 degrees F for 60 minutes or until the loaf is cooked throughout. Use a toothpick to check for doneness.
Allow to cool completely in loaf pan on a cooling rack before removing.